Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 1, NWS Norman, OK

April 6, 2001Ellis County, Roger Mills County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 6, 2001, 7:07 PM CDT for Ellis County, Roger Mills County, Oklahoma. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Apr 6, 2001, 7:07 PM CDT (00:07 UTC)
Expired: Apr 6, 2001, 7:30 PM CDT
In force: 23 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Ellis County, OK, Roger Mills County, OK

The radar

The Vance AFB radar (KVNX), 173 km from the middle of the area, began a volume at 00:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 6, 4:00 PM CDT	Tornado Watch	SPC	5 hr
Apr 6, 7:00 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.1 hours before the alert went out and 191 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1259 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 344 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS54 KOUN 070007
TOROKC
OKC045-129-070030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
707 PM CDT FRI APR 6 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  ELLIS COUNTY IN NORTHWEST OKLAHOMA
  ROGER MILLS COUNTY IN WESTERN OKLAHOMA

* UNTIL 730 PM CDT

* AT 707 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 6 MILES SOUTHWEST OF DURHAM...MOVING
  NORTHEAST AT 65 MPH.

* LOCATIONS IN THE WARNING INCLUDE ANGORA...ARNETT...CRAWFORD...
  DURHAM AND ROLL

TAKE COVER NOW. LEAVE MOBILE HOMES AND VEHICLES. IF POSSIBLE...MOVE
TO A BASEMENT OR STORM SHELTER. OTHERWISE MOVE TO AN INTERIOR ROOM OR
HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS AND OUTSIDE
WALLS.

THIS TORNADO IS LIKELY OBSCURED BY RAIN AND MAY NOT BE VISIBLE.
ABANDON MOBILE HOMES AND VEHICLES. IF POSSIBLE... MOVE TO A BASEMENT
OR STORM SHELRTER. OTHERWISE MOVE TO AN INTERIOR ROOM OR HALLWAY ON
THE LOWEST FLOOR. STAY AWAY FROM WINDOWS.

LAT...LON 3587 10004 3570 9998 3577 9939 3612 9943
          3622 9972

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Major, Roger Mills, Woodward	52 min
Apr 6, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	52 min
Apr 6, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Washita	52 min
Apr 6, 7:31 PM CDT	Tornado Warning	OUN	Dewey, Ellis, Woodward	29 min
Apr 6, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woods, Woodward	45 min
Apr 6, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	45 min
Apr 6, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	45 min
Apr 6, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	45 min
Apr 6, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher, Major	45 min
Apr 6, 9:28 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	47 min

Nearby

Tornado Warnings in Oklahoma, 2001 Every tornado warning in 2001 Tornadoes in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.